Stabilisation of pyrrolopyrrole pigments

Abstract: Pigment compositions comprising a) at least one pyrrolo[3,4-c]pyrrole pigment of the formula in which A and B, independently of one another, are isocyclic or heterocyclic aromatic radicals, and D is an oxygen or sulfur atom, and b) from 1 to 100 % by weight, based on the pigment, of an N-hydrocarbyloxy amine. These pigment compositions are distinguished by excellent light stability and weathering resistance.

Description: The present invention relates to the stabilisation of pyrrolopyrrole pigments against the effects of light and weathering by addition of an N-hydrocarbyloxy amine. Pyrrolo[3,4-c]pyrrole pigments have been known for some years and are described, for example, in US-A 4 415 685 and US- A 4 579 949. Some of these have proven successful as high-quality pigments. Although they already have very good light stability and weathering resistance, it has now been found that these properties can, surprisingly, be further improved, in transparent as well as in opaque pigment forms, if the pigments are mixed with an N-hydrocarbyloxy amine. N-hydrocarbyloxy amines, in particular N-hydrocarbyloxy derivatives of HALS (Hindered Amine Light Stabiliser), have been disclosed e.g. in US Patents 4 921 962, 5 019 613, 5 021 483, 5 021 486, 5 021 577 and in EP-A 389 428 as light stabilisers for polymers against the degradative effects of actinic stimuli. They were found particularly effective in stabilising organic materials such as polyolefins, elastomers, polyvinyl chloride, polyesters, polyurethanes, ambient cured and acid catalysed thermoset coatings or enamels. EP-A 309 401 discloses the use of N-hydroxy-HALS for preventing inadequacies such as embrittlement, cracking, corrosion, erosion, loss of gloss, chalking and yellowing of coatings containing some specific organic pigments such as phthalocyanine and azo pigments. It has now been found that very surprisingly, the light stability and weathering resistance of pyrrolopyrrole pigments, which is already high, can be further improved by mixing or coating the pigment particles with an N-hydrocarbyloxy amine. The present invention accordingly relates to light-stabilised pigment compositions comprising a) at least one pyrrolo[3,4-c]pyrrole pigment of the formula in which A and B, independently of one another, are isocyclic or heterocyclic aromatic radicals, and D is an oxygen or sulfur atom, and b) from 1 to 100 % by weight, based on the pigment, of an N-hydrocarbyloxy amine. Pyrrolo[3,4-c]pyrrole pigments are known. They are described in detail, for example, in US-A 4 415 685, columns 1, 2 and 3, and in particular in Examples 1, 6 and 27 to 49, and in US-A 4 579 949, in particular in Examples 1 to 46. The N-hydrocarbyloxy amines are likewise known compounds. Any that are still novel can be prepared in analogy to well known methods. Of particular interest are pigment compositions in which a pyrrolo[3,4-c]pyrrole pigment of the formula I is employed, in which A and B, independently of one another, are groups of the formula in which R 1 and R 2 , independently of one another, are hydrogen, halogen, C 1 -C 6 alkyl, C 1 -C 18 alkoxy, C 1 -C 18 alkylmercapto, C 1 -C 18 alkylamino, CN, NO 2 , phenyl, trifluoromethyl, C 5 -C 6 cycloalkyl, imidazolyl, pyrrazolyl, triazolyl, piperazinyl, pyrrolyl, oxazolyl, benzoxazolyl, benzothiazolyl, benzimidazolyl, morpholinyl, piperidinyl or pyrrolidinyl, E is -O-, -S-, -SO-, -SO 2 - or -NR 7 -, R 3 and R 4 , independently of one another, are hydrogen, halogen, C 1 -C 6 alkyl, C 1 -C 18 alkoxy or CN, R 5 and R 6 , independently of one another, are hydrogen, halogen or C 1 -C 6 alkyl, and R 7 is hydrogen or C 1 -C 6 alkyl. Any halogen substituents are, for example, iodine, fluorine, in particular bromine and preferably chlorine. C 1 -C 6 Alkyl is, for example, methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, tert-butyl, n-amyl, tert-amyl or hexyl. C 1 -C 18 Alkoxy is, for example, methoxy, ethoxy, n-propoxy, isopropoxy, butoxy, hexyloxy, decyloxy, dodecyloxy, hexadecyloxy or octadecyloxy. C 1 -C 18 Alkylmercapto is, for example, methylmercapto, ethylmercapto, propylmercapto, butylmercapto, octylmercapto, decylmercapto, hexadecylmercapto or octadecylmercapto. C 1 -C 18 Alkylamino is, for example, methylamino, ethylamino, propylamino, hexylamino, decylamino, hexadecylamino or octadecylamino. C 5 -C 6 Cycloalkyl is cyclopentyl or, in particular, cyclohexyl. Particular preference is given to pyrrolo[3,4-c]pyrrole pigments of the formula I in which A and B, independently of one another, are groups of the formula or in which R 1 and R 2 , independently of one another, are hydrogen, chlorine, bromine, C 1 -C 4 alkyl, C 1 -C 6 alkoxy, C 1 -C 6 alkylamino, CN or phenyl, E is -O-, -NR 7 - or -SO 2 -, R 3 and R 4 are hydrogen, R 7 is hydrogen, methyl or ethyl, and D is an oxygen atom, in particular those of the formula in which R 1 and R 2 , independently of one another, are hydrogen, methyl, tert-butyl, chlorine, bromine, CN or phenyl. The N-hydrocarbyloxy amine is preferably employed in an amount of 5-100 % by weight, based on the pigment. In principle, any known N-hydrocarbyloxy amine, but if desired also novel N-hydrocarbyloxy amine which can be prepared analogously to methods known in general terms, can be used for stabilisation. However, it is expedient to use a compound of the formula or a compound containing at least a group of the formula in which R is C 1 -C 18 alkyl, C 2 -C 12 alkenyl, C 2 -C 12 alkynyl, C 5 -C 12 cycloalkyl, C 6 -C 10 aryl or C 7 -C 12 aralkyl and R 8 and R 9 , independently of one another, are phenyl or naphthyl, which is unsubstituted or monosubstituted or disubstituted by C 1 -C 18 alkyl, C 1 -C 18 alkoxy or C 2 -C 12 alkenyl, or R 8 and R 9 together form a group, R 10 and R 11 , independently of one another, are methyl, ethyl or phenyl, or together form a 4-12-membered aliphatic ring, or R 10 is hydrogen and the two R 11 radicals together are a divalent radical which, together with the group, form a 4-, 5- or 6-membered ring, and L is an aromatic radical. R 10 and R 11 are preferably methyl. Of particular interest are pigment compositions in which an N-hydrocarbyloxy amine of the formula or is used in which R is tert.-butyl, C 7 -C 18 -alkyl or C 5 -C 6 -cycloalkyl, R 12 is C 1 -C 18 alkyl or C 1 -C 18 alkoxy, G is a divalent group of the formula -CR 13 -CH 2 - or -CHR 13 -CH 2 - and R 13 is C 1 -C 18 alkyl, Q is a group of the formula in which the bond denoted by * is the bond leading to T, T is a direct bond or a group of the formula in which R 14 is hydrogen, halogen or C 1 -C 4 alkyl, or is -(CH 2 ) r -, in which r is 1 or 2, m is the number 1, 2, 3, 4 or 6, X, if m = 1, is hydrogen, C 1 -C 18 alkyl, phenyl which is unsubstituted or substituted by C 1 -C 4 alkyl, C 1 -C 4 alkoxy, phenyl or halogen, or, under the condition that T, if bonded to a nitrogen atom, is not a direct bond, is a group of the formula -OCO-NR 15 R 16 , -OSO 2 -NR 15 R 16 , -OCO-R 16 , -COOR 16 , -CONR 15 R 16 , -NR 15 -COR 16 , -NR 15 -CONR 15 R 16 , -OR 16 , -NR 15 R 16 , in which R 15 is hydrogen or C 1 -C 18 alkyl, R 16 is C 1 -C 18 alkyl, C 2 -C 12 alkenyl, C 5 -C 12 cycloalkyl, phenyl or naphthyl which is unsubstituted or substituted by C 1 -C 4 alkyl, C 1 -C 4 alkoxy, halogen, phenyl or nitro, or a -(CH 2 ) s -CHR 17 R 18 group where s is zero, 1, 2 or 3, R 17 is hydrogen, methyl or phenyl, and R 18 is -OH, halogen, -COOCH 3 or -COOC 2 H 5 , if m = 2, is a group of the formula -(CH 2 or, under the condition that T, if bonded to a nitrogen atom, is not a direct bond, a group of the formula -O-(CH 2 ) p -O-, -NR 15 -(CH 2 ) p -NR 15 -, -OCO-F-COO-, -NR 15 -CO-F-CO-NR 15 -, -OCO-NH-F-NH-COO- or -NR 15 -CONH-F-NHCO-NR 15 -, in which F is -(CH 2 ) p -, and p is a number between 2 and 10, if m = 3, is a group, and if m = 4, is a group, and if m = 6, is a group, n is the number 1 or 2, V, if n = 1, is C 2 -C 8 alkylene, hydroxyalkylene or C 4 -C 22 acyloxyalkylene, and, if n = 2, is the (-CH 2 ) 2 C(CH 2 -) 2 or C group, and Z is a group of the formula in which the bond denoted by * is the bond leading to W, and W, if n = 1, is a -OCOR 19 group, in which R 19 is C 1 -C 18 alkyl, or phenyl or naphthyl which is unsubstituted or substituted by C 1 -C 4 alkyl, C 1 -C 4 alkoxy or halogen, and if n = 2, is a group of the formula -OCO-(CH 2 ) p -COO- or Any C 1 -C 4 alkyl substituents are, for example, methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl or tert-butyl, and C 1 -C 18 alkyl is additionally, for example, n-amyl, tert-amyl, hexyl, heptyl, octyl, 2-ethylhexyl, decyl, dodecyl, tetradecyl, hexadecyl or octadecyl. C 1 -C 4 -Alkoxy is, for example, methoxy, ethoxy, n-propoxy, isopropoxy or butoxy, and C 1 -C 18 alkoxy is additionally, for example, hexyloxy, decyloxy, dodecyloxy, hexadecyloxy or octadecyloxy. Halogen is, for example, iodine, fluorine, in particular bromine and preferably chlorine. Any C 2 -C 12 alkenyl substituents are, for example, vinyl, allyl, methallyl, 2-butenyl, 2-hexenyl, 3-hexenyl, 2-octenyl or 2-dodecenyl. Alkynyl is preferably propargyl. C 6 -C 10 aryl R is, for example, phenyl, naphthyl or tolyl and C 7 -C 12 aralkyl R is, for example, benzyl, α-methylbenzyl or α,α-dimethylbenzyl. C 5 -C 12 cycloalkyl R and R 16 are, for example, cyclopentyl, cycloheptyl, cyclooctyl, cyclononyl, cyclododecyl or preferably cyclohexyl. C 2 -C 8 alkylene or -hydroxyalkylene V is, for example, ethylene, 1-methylethylene, propylene, 2-ethylpropylene or 2-ethyl-2-hydroxymethylpropylene, and C 4 -C 22 acyloxyalkylene V is, for example, 2-ethyl-2-acetoxymethylpropylene. Of particular interest are pigment compositions in which an N-hydrocarbyloxy amine of the formula VII, VIII or IX as defined above is used. Particular preference is given to N-hydrocarbyloxy amines of the formula or in which R is as defined in the preferred meaning mentioned above, T is a direct bond, m is 1, 2 or 3, X 1 , if m = 1, is C 1 -C 18 alkyl, -OCO-R 16 , -NR 15 -COR 16 or in which R 15 is hydrogen or or C 1 -C 18 alkyl, and R 16 is C 1 -C 18 alkyl, or phenyl or naphtyl which is unsubstituted or substituted by C 1 -C 4 alkyl, C 1 -C 4 alkoxy, phenyl or halogen, if m = 2, is a -OCO-(CH 2 ) p -OCO- or -NR 15 CO-(CH 2 ) p -CONR 15 - group in which p is a number between 2 and 8, and if m = 3, is a group, X 2 is C 1 -C 18 alkyl, n is the number 2, and V is the (-CH 2 ) 2 C(CH 2 -) 2 or C group. Preference is given to N-hydrocarbyloxy amines of the formula XI or XII in which R is tert.-butyl, n-heptyl, n-octyl or cyclohexyl, T is a direct bond, X 1 , if m is 1, is benzoyloxy or naphthyloxy, if m is 2, is a group -OCO-(CH 2 ) p -OCO- in which p is a number between 2 and 8, and X 2 is C 8 -C 18 alkyl. As mentioned above, the pyrrolo[3,4-c]pyrrole pigments are stabilised by the admixture of an N-hydrocarbyloxy amine against the action of light and weathering, which can result in fading, but also darkening of the colourings. The novel admixing of the N-hydrocarbyloxy amine with the pigment has proven to be effective, i.e. stabilising, in both cases. Accordingly, the invention furthermore relates to a process for the light and weathering stabilisation of pyrrolo[3,4-c]pyrrole pigments of the formula in which A and B, independently of one another, are isocyclic or heterocyclic aromatic radicals, and D is an oxygen or sulfur atom, comprising mixing or coating the pigment particles with from 1 to 100 % by weight, based on the pigment, of an N-hydrocarbyloxy amine as defined above. This can be carried out by the various methods below: The N-hydrocarbyloxy amine in the desired amount is dissolved in an organic solvent. The pigment is suspended in this solution by conventional methods, and the resultant suspension is dispersed, if necessary, in a conventional mill. The pigment mixture is isolated by removing the solvent by distillation and is subsequently dried; The necessary amount of N-hydrocarbyloxy amine is, dissolved in an organic solvent, added to a pigment suspension prepared by conventional methods and then, by addition of a solvent in which it is insoluble, for example water, is precipitated and co-suspended. The suspension is then filtered, and the pigment mixture is isolated by conventional methods; In a preferred method, however, the pigment and the N-hydrocarbyloxy amine are either premixed or incorporated separately by conventional methods in the desired amount into the substrate to be pigmented. The pigment compositions according to the invention are highly suitable as pigments for colouring high-molecular-weight organic material, in particular give high light stability and weathering resistance are required. Examples of high-molecular-weight organic materials which can be pigmented by means of the pigment compositions according to the invention are cellulose ethers and cellulose esters, such as ethylcellulose, nitrocellulose, cellulose acetate and cellulose butyrate, natural or synthetic resins, such as polymerisation resins or condensation resins, such as amino resins, in particular urea- and melamine-formaldehyde resins, alkyd resins, phenolic resins, polycarbonates, polyolefins, polystyrene, polyvinyl chloride, polyamides, polyurethanes, polyesters, ABS, polyphenylene oxides, rubber, casein, silicone and silicone resins, individually or in mixtures. The pigment compositions according to the invention are particularly suitable for colouring polyvinyl chloride and polyolefins, such as polyethylene and polypropylene, and for pigmenting paints, coating materials and printing inks. However, their high light stability means that they are also highly suitable for use in electrophotographic materials (for example photocells), coloured filters (for example liquid-crystal displays), information-storage materials (optical disks), nonlinear optics and in optical limiters. However, the pigment compositions according to the invention are preferably suitable for colouring water-borne and/or solvent-containing paints, in particular automotive paints. The high-molecular-weight organic compounds mentioned may, individually or in mixtures, be in the form of plastic compositions, melts, spinning solutions, paints, coating materials or printing inks. Depending on the application, it has proven advantageous to employ the pigment compositions according to the invention as toners or in the form of formulations. Based on the high-molecular weight organic material to be pigmented, the pigment compositions according to the invention can be employed in an amount of from 0.01 to 40 % by weight, preferably from 0.1 to 20 % by weight. The pigmenting of the high-molecular-weight organic substances by means of the pigment compositions according to the invention is carried out, for example, by mixing a pigment composition of this type, if desired in the form of a masterbatch, or the individual components, with these substances using roll mills, mixers or grinders. The pigmented material is then converted into the final shape desired by processes known per se, such as calandering, compression moulding, extrusion, coating, casting or injection moulding. It is frequently desirable, for the production of non-rigid mouldings or to reduce their brittleness, to incorporate plasticisers into the high-molecular-weight compounds before shaping. These may be, for example, esters of phosphoric acid, phthalic acid or sebacic acid. The plasticisers can be incorporated into the polymers before or after incorporation of the pigment compositions according to the invention. In order to obtain different shades, it is furthermore possible to incorporate fillers or other chromophoric components such as white, coloured or black pigments, in any desired amounts in addition to the pigment compositions according to the invention. For pigmenting paints, coating materials and printing inks, the high-molecular-weight organic materials and the pigment compositions according to the invention, if desired together with additives, such as fillers, other pigments, driers or plasticisers, are finely dispersed or dissolved in a joint organic solvent or solvent mixture. This can be done by dispersing or dissolving the individual components separately or more than one together and only then combining all the components. In colourings, for example of paints, polyvinyl chloride or polyolefins, the pigment compositions according to the invention are distinguished by good general pigment properties, such as good dispersibility, high tinting strength and purity, and good migration, heat and in particular light and weathering resistance. The examples below illustrate the invention. Parts are by weight, unless stated otherwise. Examples 1-14: 0.5 g of a red pigment of the formula and 0.05 g of an N-hydrocarbyloxy amine of the formula 9.5 g of TiO 2 , 3 g of xylene and 30 g of stoving lacquer comprising 56 parts of alkyd resin ®ALFTALAT AC 451M (Hoechst AG, 60 % in xylene/Solvesso 150* ), 23 parts of melamine resin ®MAPRENAL MF 600 (Hoechst AG, 65 % in n-butanol/isobutanol), 20 parts of xylene and 1.0 part of silicone oil (1 % in xylene) are mixed by conventional methods. The coloured paint is applied to aluminium sheeting and stoved for 30 minutes at 130°C. Further paint colourings are produced in precisely the same way, with the only exception that the N-hydrocarbyloxy amine of the formula XV is replaced by the same amount by weight of the N-hydrocarbyloxy amine indicated in Table 1 below. A control paint colouring is produced, again in the same way, with the exception that the pigment is employed without addition of N-hydrocarbyloxy amine. The weathering resistance of the resultant paint colourings is determined by the WOM test in accordance with DIN 53387 after weathering for 500 hours. In all the examples shown, better weathering resistance than in the control paint colouring can be demonstrated. Examples 15-16: 0.4 g of the pigment of the formula XIV and 0.04 g of the N-hydrocarbyloxy amines shown in Table 2 are incorporated separately, but otherwise in the same way, into the same alkyd-melamine stoving lacquer (white reduction) as in Example 1 (method B). The weathering resistance of the paint colourings obtained is determined as described in Example 1. In all the examples shown, better weathering resistance than in the control coloured coating can be demonstrated using the same pigment. Examples 17 and 18: 0.2 g of the N-hydrocarbyloxy amine of the formula XV are added to a suspension of 2 g of the pigment of the formula XIV in methanol (the former dissolves in the methanol during the addition). The suspension is stirred for 2 hours, 100 ml of water are added, and the suspension is stirred at room temperature over night. A further 200 ml of water are then added, and the suspension is filtered. The residue is dried at 100°C (method C). The process is repeated, with the single exception that the N-hydrocarbyloxy amine of the formula XV is replaced by the same amount by weight of the N-hydrocarbyloxy amine described in Example 6 dissolved in 7 ml of chloroform. The two products are each incorporated in the same way into the same alkyd-melamine stoving lacquer (white reduction) as in Example 1. The weathering resistance of the coloured coatings obtained is determined as described in Example 1. In both examples, better weathering resistance than in the corresponding control coloured coating can be demonstrated. Example 19: Example 1 is repeated, with the exception that the pigment of the formula XIV is replaced by the same amount by weight of a pigment of the formula and the N-hydrocarbyloxy amine of the formula XV is replaced by the same amount by weight of the N-hydrocarbyloxy amine described in Example 4. Better weathering resistance than in the corresponding control coloured coating is obtained. Examples 20-22: Example 1 is repeated, with the exception that the pigment of the formula XIV is replaced by the same amount by weight of the pigment of the formula and the N-hydrocarbyloxy amine by the same amount of the N-hydrocarbyloxy amines shown in Table 4 below. In all the examples, better weathering resistance is observed than for the corresponding control coloured coating. Examples 23-37: Example 1 is repeated, with the single exception that the N-hydrocarbyloxy amine of the formula XV is in each case employed in the amount by weight shown in Table 5 below, in % based on the pigment. Example % of N-hydrocarbyloxy amine 23 1 24 2 25 5 26 10 27 15 28 20 29 25 30 30 31 40 32 50 33 60 34 70 35 80 36 90 37 100 Examples 38-41: Solution A Formulation: 67.1 parts of A1: 8.2 % solution of 86 parts of cellulose acetobutyrate (25 % in butyl acetate), 4 parts of zirconium octanoate, 48 parts of SOLVESSO 150® (aromatic solvent from ESSO), 70 parts butyl acetate and 52 parts of xylene; 24.8 parts of A2: polyester resin DYNAPOL H 700® (60 %, from Dynamit Nobel); 3.1 parts of A3: melamine resin MAPRENAL MF 650® (55 %, from Hoechst AG). Dispersion B Formulation: 12.3 parts of aluminium paste Silverline 3334® (Silverline); 8.0 parts of SOLVESSO 150®; 59.34 parts of A1; 21.92 parts of A2; 2.74 parts of A3. A 1:1 mixture of a) a dispersion, obtained by conventional methods, of 5 parts of the pigment of the formula XIV and 5 parts of one of the N-hydrocarbyloxy amine shown in Table 6 in solution A and b) the dispersion B is applied by means of a spray gun. After brief drying, a clear coat based on a thermocurable acrylic varnish is applied and stoved at 130°C for 30 minutes. A red metal-effect finish is obtained. A control coloured coating is produced in the same way, with the exception that the pigment is employed without addition of N-hydrocarbyloxy amine. The weathering resistance of the resultant coloured coatings is determined by the WOM test after weathering for 2000 hours. All the examples show better weathering resistance than that of the control coloured coating. Examples 42-44: Example 38 is repeated, with the exception that the pigment of the formula XIV is replaced by the same amount by weight of the pigment of the formula XVII and the N-hydrocarbyloxy amine by the same amount of the N-hydrocarbyloxy amines shown in Table 7 below. In all the examples, better weathering resistance is observed than in the corresponding control coloured coating. Examples 45-47: 0.5 g of the pigment of the formula XIV, 0.1 g of one of the N-hydrocarbyloxy amine shown in Table 8 below and 16.2 g of a nitrocellulose printing ink comprising 11 g of nitrocellulose A 250, 9 g of DOWANOL PM® (Dow Chem.), 20 g of ethyl acetate and 60 g of ethanol are mixed by conventional methods. The printing ink obtained is applied to paper. The light stability is determined by the fadeometer test after exposure for 500 hours. All three examples show better light fastnesss than the corresponding control, which is obtained in the same way, but without addition of the N-hydrocarbyloxy amine. Examples 48-50: Examples 45-47 are repeated, with the single exception that the pigment of the formula XIV is replaced by the same amount by weight of the pigment of the formula XVII. These examples also show better light stability than in the corresponding control coloured coating. Examples 51-53: 0.7 g of the pigment of the formula XIV and 0.35 g of one of the N-hydrocarbyloxy amine shown in Table 9 below are mixed in dry form with 700 g of polyethylene VESTOLEN A 6016® (Hüls) and 1.4 g of calcium carbonate MILICARB®. The mixture is subsequently extruded twice at 200°C in a single-screw extruder. The resultant granules are converted into sheets in an injection-moulding machine at 200°C. The weathering resistance is determined by weathering the sheets as described in Example 1 for the coloured coatings. These examples also show better weathering resistance than in the corresponding control coloured coating without N-hydrocarbyloxy amine.

Claims: A light-stabilised pigment composition comprising a) at least one pyrrolo[3,4-c]pyrrole pigment of the formula in which A and B, independently of one another, are isocyclic or heterocyclic aromatic radicals, and D is an oxygen or sulfur atom, and b) from 1 to 100 % by weight, based on the pigment, of an N-hydrocarbyloxy amine. A pigment composition according to claim 1, wherein the pigment is a pyrrolo[3,4-c]pyrrole of the formula I in which A and B, independently of one another, are groups of the formula in which R 1 and R 2 , independently of one another, are hydrogen, halogen, C 1 -C 6 alkyl, C 1 -C 18 alkoxy, C 1 -C 18 alkylmercapto, C 1 -C 18 alkylamino, CN, NO 2 , phenyl, trifluoromethyl, C 5 -C 6 cycloalkyl, imidazolyl, pyrrazolyl, triazolyl, piperazinyl, pyrrolyl, oxazolyl, benzoxazolyl, benzothiazolyl, benzimidazolyl, morpholinyl, piperidinyl or pyrrolidinyl, E is -O-, -S-, -SO-, -SO 2 - or -NR 7 -, R 3 and R 4 , independently of one another, are hydrogen, halogen, C 1 -C 6 alkyl, C 1 -C 18 alkoxy or CN, R 5 and R 6 , independently of one another, are hydrogen, halogen or C 1 -C 6 alkyl, and R 7 is hydrogen or C 1 -C 6 alkyl. A pigment composition according to claim 2, wherein the pigment is a pyrrolo[3,4-c]pyrrole of the formula I in which A and B, independently of one another, are groups of the formula or in which R 1 and R 2 , independently of one another, are hydrogen, chlorine, bromine, C 1 -C 4 alkyl, C 1 -C 6 alkoxy, C 1 -C 6 alkylamino, CN or phenyl, E is -O-, -NR 7 - or -SO 2 -, R 3 and R 4 are hydrogen, R 7 is hydrogen, methyl or ethyl, and D is an oxygen atom. A pigment composition according to claim 2, wherein the pigment is a pyrrolo[3,4-c]pyrrole of the formula in which R 1 and R 2 , independently of one another, are hydrogen, methyl, tert-butyl, chlorine, bromine, CN or phenyl. A pigment composition according to claim 1, wherein the N-hydrocarbyloxy amine is employed in an amount of 5-100 % by weight, based on the pigment. A pigment composition according to claim 1, wherein the N-hydrocarbyloxy amine is a compound of the formula or a compound containing at least a group of the formula in which R is C 1 -C 18 alkyl, C 2 -C 12 alkenyl, C 2 -C 12 alkynyl, C 5 -C 12 cycloalkyl, C 6 -C 10 aryl or C 7 -C 12 aralkyl and R 8 and R 9 , independently of one another, are phenyl or naphthyl, which is unsubstituted or monosubstituted or disubstituted by C 1 -C 18 alkyl, C 1 -C 18 alkoxy or C 2 -C 12 alkenyl, or R 8 and R 9 together form a group, R 10 and R 11 , independently of one another, are methyl, ethyl or phenyl, or together form a 4-12-membered aliphatic ring, or R 10 is hydrogen and the two R 11 radicals together are a divalent radical which, together with the group, form a 4-, 5- or 6-membered ring, and L is an aromatic radical. A pigment composition according to claim 6, wherein a N-hydrocarbyloxy amine containing at least one group of the formula IV or V in which R 10 and R 11 are methyl is used. A pigment composition according to claim 6, wherein a N-hydrocarbyloxy amine of the formula or is used in which R is tert.-butyl, C 7 -C 18 -alkyl or C 5 -C 6 -cycloalkyl, R 12 is C 1 -C 18 alkyl or C 1 -C 18 alkoxy, G is a divalent group of the formula -CR 13 -CH 2 - or -CHR 13 -CH 2 - and R 13 is C 1 -C 18 alkyl, Q is a group of the formula in which the bond denoted by * is the bond leading to T, T is a direct bond or a group of the formula in which R 14 is hydrogen, halogen or C 1 -C 4 alkyl, or is -(CH 2 ) r -, in which r is 1 or 2, m is the number 1, 2, 3, 4 or 6, X, if m = 1, is hydrogen, C 1 -C 18 alkyl, phenyl which is unsubstituted or substituted by C 1 -C 4 alkyl, C 1 -C 4 alkoxy, phenyl or halogen, or, under the condition that T, if bonded to a nitrogen atom, is not a direct bond, is a group of the formula -OCO-NR 15 R 16 , -OSO 2 -NR 15 R 16 , -OCO-R 16 , -COOR 16 , -CONR 15 R 16 , -NR 15 -COR 16 , -NR 15 -CONR 15 R 16 , -OR 16 , -NR 15 R 16 , in which R 15 is hydrogen or C 1 -C 18 alkyl, R 16 is C 1 -C 18 alkyl, C 2 -C 12 alkenyl, C 5 -C 12 cycloalkyl, phenyl or naphthyl which is unsubstituted or substituted by C 1 -C 4 alkyl, C 1 -C 4 alkoxy, halogen, phenyl or nitro, or a -(CH 2 ) s -CHR 17 R 18 group where s is zero, 1, 2 or 3, R 17 is hydrogen, methyl or phenyl, and R 18 is -OH, halogen, -COOCH 3 or -COOC 2 H 5 , if m = 2, is a group of the formula -(CH 2 or, under the condition that T, if bonded to a nitrogen atom, is not a direct bond, a group of the formula -O-(CH 2 ) p -O-, -NR 15 -(CH 2 ) p -NR 15 -, -OCO-F-COO-, -NR 15 -CO-F-CO-NR 15 -, -OCO-NH-F-NH-COO- or -NR 15 -CONH-F-NHCO-NR 15 -, in which F is -(CH 2 ) p -, and p is a number between 2 and 10, if m = 3, is a group, and if m = 4, is a group, and if m = 6, is a group, n is the number 1 or 2, V, if n = 1, is C 2 -C 8 alkylene, hydroxyalkylene or C 4 -C 22 acyloxyalkylene, and, if n = 2, is the (-CH 2 ) 2 C(CH 2 -) 2 or C group, and Z is a group of the formula in which the bond denoted by * is the bond leading to W, and W, if n = 1, is a -OCOR 19 group, in which R 19 is C 1 -C 18 alkyl, or phenyl or naphthyl which is unsubstituted or substituted by C 1 -C 4 alkyl, C 1 -C 4 alkoxy or halogen, and if n = 2, is a group of the formula -OCO-(CH 2 ) p -COO- or A pigment composition according to claim 8, wherein an N-hydrocarbyloxy amine of the formula VII, VIII or IX as defined in claim 8 is used. A pigment composition according to claim 8, wherein an N-hydrocarbyloxy amine of the formula or is used in which R is as defined in claim 8 T is a direct bond, m is 1, 2 or 3, X 1 , if m = 1, is C 1 -C 18 alkyl, -OCO-R 16 , -NR 15 -COR 16 or in which R 15 is hydrogen or or C 1 -C 18 alkyl, and R 16 is C 1 -C 18 alkyl, or phenyl or naphthyl which is unsubstituted or substituted by C 1 -C 4 alkyl, C 1 -C 4 alkoxy, phenyl or halogen, if m = 2, is a -OCO-(CH 2 ) p -OCO- or -NR 15 CO-(CH 2 ) p -CONR 15 - group in which p is a number between 2 and 8, and if m = 3, is a group, X 2 is C 1 -C 18 alkyl, n is the number 2, and V is the (-CH 2 ) 2 C(CH 2 -) 2 or C group. A pigment composition according to claim 10, wherein an N-hydrocarbyloxy amine of the formula XI or XII is used in which R is tert.-butyl, n-heptyl, n-octyl or cyclohexyl, T is a direct bond, X 1 , if m is 1, is benzoyloxy or naphthyloxy, if m is 2, is a group -OCO-(CH 2 ) p -OCO- in which p is a number between 2 and 8, and X 2 is C 8 -C 18 alkyl. A process for the light-stabilisation of pyrrolo[3,4-c]pyrrole pigments of the formula in which A and B, independently of one another, are isocyclic or heterocyclic aromatic radicals, and D is an oxygen or sulfur atom, comprising mixing or coating the pigment particles with from 1 to 100 % by weight, based on the pigment, of an N-hydrocarbyloxy amine. A high-molecular-weight organic material comprising a pigment composition according to claim 1. A high-molecular-weight organic material according to claim 13, in the form of a paint. A high-molecular-weight organic material according to claim 14, in the form of an automotive paint.

Inventors: CHASSOT LAURENT DR, CHASSOT, LAURENT, DR.
Applicants: CIBA SC HOLDING AG, CIBA SPECIALTY CHEMICALS HOLDING INC.
Application year: 1994
Main classification: C09B67
IPC codes: C09B67, C08K5